Clock



FIG. 1 is a left front perspective view of a clock showing my new design;

FIG. 2 is a front elevational view of the clock of FIG. 1;

FIG. 3 is a rear elevational view of the clock of FIG. 1;

FIG. 4 is a left, side elevational view of the clock of FIG. 1 (the right side being a mirror image thereof);

FIG. 5 is a top plan view of the clock of FIG. 1; and,

FIG. 6 is a bottom plan view of the clock of FIG. 1. 

The ornamental design for a clock, as shown and described. 